Anion-specific fluorescence enhancement via counterion modulation in biphenyl-based porous cage salts.
- 1Department of Chemistry, Indiana University Bloomington IN 47405 USA [email protected].
Abstract
Porous coordination cages offer a versatile platform for integrating photophysical functionality into well-defined molecular architectures; however, many widely studied cages are intrinsically non-emissive. Here, we report counterion-dependent fluorescence switching in biphenyl-functionalized zirconium porous cages, in which anion identity strongly influences emission behavior. The cage exhibits bright fluorescence when isolated as a chloride salt, while the corresponding triflate salt is essentially non-emissive despite the same underlying Zr-bpdc connectivity. Systematic counterion exchange and qualitative salt screening show that fluorescence enhancement from the triflate form depends chiefly on anion identity rather than the accompanying cation, with nitrate giving the largest enhancement. These results identify counterion modulation as a simple strategy for tuning fluorescence in zirconium porous cages and highlight the importance of anion identity in shaping their solid-state photophysical behavior.
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BibTeX
@article{sabatino2026anionspecific,
title = {{Anion-specific fluorescence enhancement via counterion modulation in biphenyl-based porous cage salts.}},
author = {Rachel M Sabatino and Merissa N Morey and Alex Lovstedt and Eric D Bloch},
journal = {Chemical science},
year = {2026},
month = oct,
doi = {10.1039/d6sc06722k},
url = {https://europepmc.org/article/MED/42923333},
note = {CC BY},
}
RIS
TY - JOUR
TI - Anion-specific fluorescence enhancement via counterion modulation in biphenyl-based porous cage salts.
AU - Rachel M Sabatino
AU - Merissa N Morey
AU - Alex Lovstedt
AU - Eric D Bloch
PY - 2026
DA - 2026/10/22
JO - Chemical science
DO - 10.1039/d6sc06722k
UR - https://europepmc.org/article/MED/42923333
AB - Porous coordination cages offer a versatile platform for integrating photophysical functionality into well-defined molecular architectures; however, many widely studied cages are intrinsically non-emissive. Here, we report counterion-dependent fluorescence switching in biphenyl-functionalized zirconium porous cages, in which anion identity strongly influences emission behavior. The cage exhibits bright fluorescence when isolated as a chloride salt, while the corresponding triflate salt is essentially non-emissive despite the same underlying Zr-bpdc connectivity. Systematic counterion exchange and qualitative salt screening show that fluorescence enhancement from the triflate form depends chiefly on anion identity rather than the accompanying cation, with nitrate giving the largest enhancement. These results identify counterion modulation as a simple strategy for tuning fluorescence in zirconium porous cages and highlight the importance of anion identity in shaping their solid-state photophysical behavior.
SN - 2041-6520
SN - 2041-6539
ER -